sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hardness: 6.5-7 (Mohs); Color: Brick red to deep terracotta; Luster: Vitreous to waxy (dull when raw); Crystal Structure: Hexagonal (Trigonal, microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep terracotta
Luster: Vitreous to waxy (dull when raw)

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich groundwater into cracks and cavities within other rocks or as a result of chemical precipitation. The iron oxide (hematite) inclusions provide the reddish hue.

Uses & applications

Used primarily in lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for crystal collecting.

Geological facts

Known historically as the 'Stone of Endurance' and 'The Supreme Nurturer', it was used by ancient civilizations for protective amulets and seals. It is a chalcedony variety, a cryptocrystalline form of quartz.

Field identification & locations

Identify by its opaque red color and smooth, waxy feel when polished. It is commonly found globally, notably in India, Brazil, USA, and South Africa. Collectors should look for patterns of dark streaks known as bands or inclusions.

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Sandstone or Siltstone

Arenite (if sandstone)

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Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

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Shale or Slaty Mudstone

Argillaceous sedimentary rock

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Sandstone

Arenite (primarily SiO2)

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